Trembling At A High Altitude

The result of my wife's examination came out.

Image performance:

The contour of the left kidney is obviously enlarged, the structure of the renal pelvis-ureter transition is not clear, the kidney mengs and renal calyx are obviously enlarged and fluid, the left renal artery and vein are compressed and displaced; there is no abnormal density in the parenchyma of the kidneys, the right renal pelvis and kidney There were no abnormal density shadows in the calyces and ureters. The ureter was broken during the secretion period, the bladder was filled well, the wall was smooth, and no abnormal density shadows were seen in the cavity.

Image diagnosis:

Consider the stenosis of the left renal pelvis-ureteral junction (UPJ0) with hydronephrosis.

The doctor said he pumped water or put a stent. The doctor was busy and couldn't ask much.

After checking on the Internet for a long time, I can’t find out why, is there a friend who knows medicine to help explain it in detail?

Is the condition serious? Do I need open surgery for the stent?

Thank you!